Bevel saw-table gage



(N0 Modelf) B. G. LUTHER.

' 13E-VEL SAW TABLE GAG-E. I No. 255,302. Patented Maml 21,1882.

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'NITEDI STATES PATENT OEEICE.

BENJAMIN G. LUTHER, OF HEBRONVILLE, MASSACHUSETTS, ASSIGNOR TO.-

FRANK V. SAWYER, OF PROVIDENCE, RHODE ISLAND, AND CHARLES A. SAVVYER, OFMALDEN, MASSACHUSETTS.

BEVEL SAW-TABLE GAG E.

SFECIFICATION forming partA of Letters Patent No. 255,302, dated March21, 1882, Application filed November 103881. (No model.)

To all whom it may concern:

Be it known that I, BENJAMIN G. LUTHER, of Hebronville, in the county ofBristol and State of Massachusetts, haveinvented an Im-Y xo ment ofparts, as hereinafter fully set forth and claimed, whereby the gage maybe rendered useful for a great variety of work.

Figure l is a plan view of my improved gage attached to the table of acircular saw. Fig. 2 is an elevation of the same. Fig. 3 is aseotiontaken in the line x x of Fig. l. Fig. 4 is a section taken in the linefr x of Fig. l, enlarged, showing the pivot-clamp. Fig. 5 represents asection taken in the line y y ofV Fig. zo 1. Fig. 6 represents a sectiontaken in the line z z of Fig. l, with the clamp-pin turned in the sameline. Fig. 7 represents a plan View of an ordinary parallel gage,combined with the grooved bed-plate of the bevel-gage.

In the drawings, Arepresents the saw-table 5 B, the circular saw; C, ametallic bed-piece let-into the table A, and provided with the parallelgrooves c c.

Upon the bed-piece C is placed the sliding 3o piece D, provided with aslide, cl, which enters one of the grooves c, by means of which thesides of the plate D are retained in uniform relation to the plane ofthe saw B. The plate D is provided with a hub, E, upon which is pivotedthe plate F, provided with a semicircular slot, f, to receive thethumb-screw e, which serves to fasten the plate F rigidly to the plate Din any required position with relation to the saw B.

Upon the upper end of the hub E is rigidly secured the pointer a., andthe are b upon the pivoted plate F is graduated to indicate a speciemovement of the plate F vupon the plate i D. A pointer, g, is also Xedto the plate F,

f and the forward edge of the plate D is graduated to degrees, toindicate the enact movement of the plate F upon the plate D. The racksGr Gv slide in grooves h h atopposite sides of the plate F, beingsecured therein by the caps t'. t. The'racks are operated back and 5oforth by means of gears J J, attached to a shaft, K, likewise held bythe caps i t', and operated by means of the knurled wheel j. To theouter ends of the parallel racks G G is attached the guide-plate H,centrally pivoted to the ends of the racks at-the points k k.

To one end of the plate H is secured the graduated are I, which maybeclamped in any desired position by means of the clampingscrew l, whichenters a boss upon the side of 6o the adjoining rack G. A pointer, L, issecured to the side or" the rack, and serves to indicate upon thegraduated arc I the exact angular movement of the guide-plate H. Asupporting-foot, M, depends from the lower side of each of the racks GG. The guide-plate H is capable of movement ina vertical plane, as shownby the dotted lines in Fig. 3, and the combined plates F and H arecapable of movement in a horizontal direction upon the pivot 7o E, asshown by the, dotted lines in Fig. 1. The face of the guide-plate H maybe thusinelined vertically and horizontally with the plane of therevolving sawl B, and is therefore adapted to a great variety of work.The clamp-pin N, provided upon one side of its lower'end with the hook nand at theupper end with the pivoted cam O, serves to clamp the plate Dto the hed-piece C, a groove7 fm, being out in the wooden table A toreceive the hook u. The 8o cam O is made with 4unequal sides r r', inorder to serve as a clamp, irst, to the bed-piece C, as shown in Fig. 4,whereby the combination-gage will b e retained in a fixed position withrelation to the table, and, second, to the plate D, whereby thecombination-gage will be made movable over the saw-table inthe directionof the grooves c, a recess,s, being'made in the under side of the plateDto receive the hook n, as shown in Fig. 6, so that the lower 9o side ofthe hook may be raised entir'ely above the surface of the table.

The bed-piece C is provided with screwholes t t, which serve as meansfor the attach-y mentotthe ordinary parallel gage, P, as shown in Fig.7, when the combination bevel-gage,

as above described, has been removed from the saw-table.

When the several parts of the bevel-gage are clamped to the table bymeans of the clamp N O the guide-plate H may be adjusted with respect toits distance from the side of the saw B by turning the. wheel j, thusmoving the racks G G in and out, as desired, and when the properposition has been reached the' plate H may be retained in its positionby turning,r the clamping-screw o, thus securing the rack G.

The guide-plate H may be set at any desired vertical angle within thelimit of its movement by means of the arc l and clampingscrew l, and maylikewise be adjusted at any desired horizontal angle by means of theslot fand thumb-screw c. The gage may also be changed from one of thegrooves c to the other,aceording as the space required between theguide-plate and saw may be greater 0r less.

I am aware thatin PalentNo. 172,279, dated January 1S, 1S76,a saw-gageis shown similar to that herein described; but in my combination adouble rack and pinion movement is substituted for the screw for movingtheguideplate, thus controlling the position ofthe ends oi' theguide-plate in a more positive manner,

avoiding backlash or looseuess, and admit-v ting of' more rapidadjustment.

I claim as my invention- 1. Ina bevel-gage for circular saws,thecombination ot' the bcdpiece C, provided with a groove, c, slidingplate D, pivoted plate F, gears J J, secured to the shaft K, racks G G,and pivoted guide-plate H, substantially as and for the purpose setforth.

2. In a bevel-gage for circular saws, the combination of the groovedbed-plate C, sliding plate D, and pivoted plate F, with the clamppin N,provided with the hook u, and cam O, having unequal sides r r', wherebythe sliding plate D and pivotetl plate F maybe eitherimmovably securedto the bed-plate C or secured to each other in sliding connection withthe bed-plate C, substantially as described.

BENJAMIN G. LUTHER.

Witnesses:

HARMON S. BABcoeK, SoCRA'rEs SCHOLMELD.

